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Registered Member #193
Joined: Fri Feb 17 2006, 07:04AM
Location: sheffield
Posts: 1022
Incidentally, the reaction of ozone with carbon creates CO which is also toxic. I destroy ozone in waste gas streams by passing it through a bed of silica gel coated with silver.
If you were going to enclose the arc in a gas-tight container it would be more sensible to fill it with something other than air. Argon would be my first choice.
Registered Member #509
Joined: Sat Feb 10 2007, 07:02AM
Location:
Posts: 329
Regarding using silver to breakdown the ozone, does it catalyze the reaction (like how Pt would) or is it a consumable, tarnishing the silver until the whole surface is tarnished and thats it? Or would it be both? I.E. It catalyzes the reaction, fresh silver is oxidized in the process, but the oxide still catalyzes the reaction
Is there a way to ensure that the activated carbon would be oxidized completely to CO2 instead of CO?
Registered Member #2261
Joined: Mon Aug 03 2009, 01:19AM
Location: London, UK
Posts: 581
Bored Chemist wrote ...
Incidentally, the reaction of ozone with carbon creates CO which is also toxic. I destroy ozone in waste gas streams by passing it through a bed of silica gel coated with silver.
If you were going to enclose the arc in a gas-tight container it would be more sensible to fill it with something other than air. Argon would be my first choice.
Registered Member #3766
Joined: Sun Mar 20 2011, 05:39AM
Location:
Posts: 624
Good question about the silver being used up... @james, didn't see your post earlier, must have posted while I was typing, and you're very correct, I think I might have the perfect fan... @bored chemist, how did you coat the silica with silver?
Registered Member #193
Joined: Fri Feb 17 2006, 07:04AM
Location: sheffield
Posts: 1022
The silver is a catalyst, not a consumable. I made the coated silica by slurrying about 200 ml bulk volume of silica gel in water till it was soaked. Then I drained it and added it to a solution of about a gram of silver nitrate dissolved in water and excess ammonia. Then I added some ascorbic acid to ppt the silver. Getting the silver to come out as a nice mirror is difficult, but it's not what you want in this case. You want a grotty looking black ppt. As a word of warning, don't leave solutions of silver and ammonia standing around.
Registered Member #3766
Joined: Sun Mar 20 2011, 05:39AM
Location:
Posts: 624
I'm guessing the vapors react, exothermically...
One thing i'm slightly worried about is that silver breaks down in UV light, apparently the bonds break, and plasma makes UV light... of course if it's already ugly and black on wire, who cares?
I think I might just try to get the silver nitrate and add dip the copper wire in it. Copper is more reactive so it should react making coper nitrate and depositing the silver on the wire... I remember that this works because we did it in a lab one time... except I added 9 grams of silver nitrate instead of .9... Looked awful purdy tho
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Making Ozone go Away
